Abstract
Phenylfluorone reacts with gallium in the presence of hexadecylpyridinium bromide and pyridine to form a water-soluble chelate with an absorption maximum at 570 nm and constant absorbance in the pH range 4.0–5.5. At this wavelength, Beer's law is obeyed up to 4.3 × 10 −6 M gallium. The sensitivity is very high and the molar absorptivity is 1.48 × 10 5 1.mole −1.cm −1. The chelate has been utilized in the determination of gallium at the μg level. The ratio of gallium to phenylfluorone in the complex is 1:2.
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